Extended Red Emission in High Galactic Latitude Interstellar Clouds
Extended Red Emission in High Galactic Latitude Interstellar Clouds
复制标题
高银河纬度星际云中的扩展红光发射
DOI：
10.1086/587131
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
U. Vijh
中科院分区：
文献类型：
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作者：
A. Witt;Steve Mandel;P. Sell;T. Dixon;U. Vijh
我们报告的初步结果，从光学薄高银河系纬度云，这是为了研究这些对象的表面亮度，结构和光谱能量分布的光学成像调查。本文的主要目的是研究扩展的红色发射（ERE），已报告在银河系高纬度地区的早期调查，这是由于紫外线激发的光致发光的星际尘埃的一个尚未确定的组成部分。我们正在进行的调查与远程操作，快速，短焦距（0.5米）的望远镜配备了绝对校准的CCD相机产生2° × 3°的视野。这些望远镜位于新墨西哥州的天空，海拔7300英尺（2225米），靠近新墨西哥州的梅希尔。我们的物体的光学表面亮度通常是黑暗夜空亮度的百分之几，这意味着云SED必须从不同滤波器波段的差分表面亮度测光推导出来。我们发现了强有力的证据，证明尘埃在光学薄云中以宽（1000 μ FWHM）ERE带的形式发射，峰值发射波长接近600 nm，峰值强度约为5 × 10−9 ergs cm−2 s−1 <$−1 sr−1。这相当于这些云的总光学表面亮度的30%左右，其余的与灰尘散射光的预期一致。
We report initial results from an optical imaging survey of optically thin high Galactic latitude clouds, which is designed to study the surface brightness, structure, and spectral energy distribution of these objects. The primary aim of this paper is to study the extended red emission (ERE) that has been reported at high Galactic latitudes in earlier investigations and which is attributed to ultraviolet-excited photoluminescence of an as yet unidentified component of interstellar dust. We conduct this ongoing survey with remotely operated, fast, short focal length (0.5 m) telescopes equipped with absolutely calibrated CCD cameras yielding a field of view of 2° × 3°. The telescopes are located at New Mexico Skies at 7300 ft (2225 m) altitude near Mayhill, New Mexico. The optical surface brightness of our objects is typically a few percent of the brightness of the dark night sky, implying that the cloud SEDs must be deduced from differential surface brightness photometry in different filter bands. We find strong evidence for dust emission in the form of a broad (≳1000 Å FWHM) ERE band with peak emission near 600 nm wavelength and peak intensity of ~5 × 10−9 ergs cm−2 s−1 Å−1 sr−1 in optically thin clouds. This amounts to about 30% of the total optical surface brightness of these clouds, the remainder being consistent with expectations for dust-scattered light.